exerpt from
http://asiasociety.org/education/belief-systems-along-silk-road
Christianity spread eastward as well as westward, in the process evolving various differences from place to place in doctrine and forms of worship. The Christianity of the Silk Road was primarily the form known as Nestorianism, after the teachings of Nestorius, a 5th-century patriarch of Constantinople who soon outraged the Roman and Byzantine worlds with his unorthodox doctrines, such as taking from the Virgin her title “Mother of God.” Nestorian Christianity spread to Persia, India, and China, bringing with it the Syriac language and script ( the basis of the writing systems of several Central Asian languages); a famous inscribed stela (standing stone tablet) in Xi’an, dated 781, commemorates the official arrival of Nestorian missionaries in China. By that time, Nestorian churches were to be found in cities all along the Silk Road, though there were undoubtedly many fewer Christians than Buddhists in Central Asia.
What I had heard was that it's so densely populated with Muslim/Buddism etc that most people in that area today have never heard of Christianity.There's a movement in China called "Back to Jerusalem" (who are associated with Promise Keepers now I hear}, who's goal is to get the message thru there. The training involved isn't a ordinary seminary. They practise falling out of windows handcuffed etc.
But I'm sure we must be getting off topic